Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	2019		2018		2017
Domestic	$	(2,848)	$	27,262	$	(27,722)
Mexico		194		6,704		6,598
Income (loss) before Income Taxes	$	(2,654)	$	33,966	$	(21,124)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2019		2018		2017
Current
Federal	$	—	$	(1,358)	$	(31)
State		(325)		911		605
Mexico		—		2,616		2,396
		(325)		2,169		2,970
Deferred
Federal		(546)		5,113		(21,190)
State		1,260		788		79
Mexico		—		(210)		954
		714		5,691		(20,157)
Income tax provision (benefit)	$	389	$	7,860	$	(17,187)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2019		2018		2017
Federal income tax at statutory rate	$	(558)	$	7,132	$	(7,437)
State income taxes, net of federal income tax benefit		1,633		1,319		(597)
Nondeductible per diem paid to drivers		1,173		1,182		2,476
Xpress Internacional activity		(71)		1,616		76
Tax credits		(1,341)		(1,611)		(970)
Provision to return adjustment		(138)		35		248
Valuation allowance		567		2,433		950
Foreign transition tax on deemed distribution		—		(30)		2,315
Global intangible low-taxed income (GILTI)		—		1,217		—
Tax Act impact of federal rate change		—		—		(14,723)
Basis difference on assets held for sale		—		(2,524)		—
Change in reserve for uncertain tax positions and settlements		(755)		(3,278)		146
Affirmative issue - imputed interest expense		—		1,223		(1,223)
Non-taxable life insurance death benefit		—		(1,004)		—
Expiration of federal capital loss carryforward		—		1,826		—
Excess tax benefits on share-based compensation		(459)		(651)		—
Deferred Mexican withholding tax		—		(876)		876
Other, net		338		(149)		676
Income tax provision (benefit)	$	389	$	7,860	$	(17,187)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2019		2018
Deferred tax assets
Allowance for doubtful accounts	$	2,075	$	1,333
Insurance and claims reserves		21,657		22,503
Compensation and employee benefits		3,394		2,973
Net operating loss and credit carryforwards		31,983		53,552
Net capital loss carryforward		4,860		—
Finance lease obligations		2,660		4,782
Investment in subsidiaries		151		6,660
Operating lease liabilities		67,860		—
Notes receivable reserve		2,639		—
Other		231		551
Valuation allowance		(6,393)		(5,826)
Total deferred tax assets	$	131,117	$	86,528
Deferred tax liabilities
Property and equipment	$	75,014	$	97,073
Intangibles		7,541		8,007
Prepaid license fees		1,011		974
Right of use assets		67,958		—
Other		285		452
Total deferred tax liabilities	$	151,809	$	106,506
Net deferred tax liability	$	20,692	$	19,978

Summary of Valuation Allowance [Table Text Block]

Deferred tax valuation allowances	Balance at
	beginning of		Charges to costs		Charges to other				Balance at end
	period		and expenses		accounts		Deductions		of period
Fiscal year ended
December 31, 2017	$	3,530	$	1,081	$	—	$	1,218	$	3,393
December 31, 2018	$	3,393	$	5,654	$	—	$	3,221	$	5,826
December 31, 2019	$	5,826	$	1,839	$	—	$	1,272	$	6,393

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	2019		2018		2017
Beginning balance	$	829	$	5,506	$	5,200
Additions based on tax positions taken in prior years				829		306
Reductions due to settlements		(829)
Reductions as a result of a lapse of the applicable statute of limitations				(5,506)		—
Balance at December 31	$	—	$	829	$	5,506